as i said it's hate here, and i might be wrong but consider the following :
for($icount=0;$icount<11;$icount++)
{
$iPid = pcntl_fork();
$iChildrenCount = 0;
if ($iPid == 0)
{
// child
echo ("child $icount\n");
}
else
{
// parrent
}
}
this is essential what you do in your example? If so, this code does not
start 10 children. It starts more.
2009/1/23 Nathan Rixham <nrixham@xxxxxxxxx>
> Török Alpár wrote:
>
>> 2009/1/23 Nathan Rixham <nrixham@xxxxxxxxx>
>>
>> bruce wrote:
>>>
>>> A simple question (or so I thought).
>>>>
>>>> Does php allow an app to create/start a process/application that can
>>>> continue to run on its own, after the initiating program/app terminates?
>>>>
>>>> It appears that the spawning/forking functions might work, but the child
>>>> apps would be in a zombie status, and couldn't be killed by an external
>>>> program.
>>>>
>>>>
>>>> you keep mentioning this zombie state; make sure that all you're child
>>> processes have an exit(); at the end or at the end of the code where they
>>> are finished; otherwise you get the xombies!
>>>
>>> also here is a very simple model you can follow that invariably works for
>>> me:
>>>
>>> this will run 10 worker threads:
>>>
>>> controller:
>>> <?php
>>> include './your.framework.php';
>>> for($icount=0;$icount<11;$icount++) {
>>> include './worker.php';
>>> }
>>> ?>
>>>
>>> worker:
>>> <?php
>>> $pid=pcntl_fork();
>>> if(!$pid) {
>>> while(1) {
>>> if($icount) {
>>> $offset = $icount * 50;
>>> } else {
>>> $offset = 0;
>>> }
>>> $db = new mysql_handler( $connection );
>>> $job_list = new job_list;
>>> if( $jobs = $job_list->get($offset) ) {
>>> foreach($jobs as $jdex => $job ) {
>>> //do something with the job
>>> }
>>> } else {
>>> sleep(10);
>>> }
>>> }
>>> } else {
>>> echo "\ndaemon launcher done id $pid\n";
>>> }
>>> ?>
>>>
>>
>> This would start more than 10 children. Children will continue on with for
>> loop after they do their work. As you advice that the children have an
>> exit,
>> i assume that you just overlooked it while writing this example. Also, a
>> wait on the children, at some point, gets rid of the zombies, as i see
>> from
>> your code, there is no way you won't have zombie processes, unless the
>> parent exists, and then the zombies also disappear.
>>
>> I hope i got it right, it's late here :)
>>
>>
>>
> lol the script will only run 10 children, and as mentioned directly below,
> it is designed to run forever - the example doesn't fit the exact needs, but
> following bruces earlier posts this may be a model he can follow. I'm aware
> it could be fleshed out with much more code and error handling, but it's
> just a little model to get one started :)
>
> regards torak and hope you're well!
>
>
> the above code is designed to run indefinately in a constant loop which
>>> polls a database for work to do
>>>
>>> this is just a very simple example, there are far more complex ways of
>>> doing it, keeping a track of how many processes you have, spawning new
>>> ones
>>> when you need them etc etc, but this i find works v well for me, the key
>>> is
>>> the $offset; getting jobs from a database and this literally is the
>>> offset
>>> used, so if you have say 200 emails to get and each script processes 50
>>> at a
>>> time, only 4 of your threads are working, bump it up to 10000 and all of
>>> them work until the queue drops; the sleep(10) and the spawn process of
>>> about 1 per second ensures that you're polling every second so jobs are
>>> picked up quickly. it's a lot of functionality for so little code :)
>>>
>>>
>>>
>>> --
>>> PHP General Mailing List (http://www.php.net/)
>>> To unsubscribe, visit: http://www.php.net/unsub.php
>>>
>>>
>>>
>>
>>
>
--
Torok, Alpar Istvan
